HANOI, Vietnam — A scientist and state media say Vietnam has identified an extremely rare set of bi-paternal twins, or twins with different fathers.

Prof. Le Dinh Luong, president of the Genetic Association of Vietnam, says DNA testing at his Hanoi lab confirmed the twins have different fathers, the first such case that he knows of in Vietnam, with only seven such cases reported in the world as of 2011.

Luong declined to give details because of confidentiality with his client.

Online newspaper Dan Tri reported that a 34-year-old man from northern Hoa Binh province had DNA testing after being pressured by his family because the twins did not look alike. One has thick wavy hair while the other has thin and straight hair.

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